              /**
               * 登录检查
               * @author 叶城廷
               * @returns {Boolean}
               */
             function checkLoginForm(){           
        	  var user_num = document.getElementById("user_num").value;
        	  var user_pwd = document.getElementById("user_pwd").value;
                  var checkNumber = document.getElementById("checkNumber").value;
   		imageNumber.src = "${pageContext.request.contextPath}/image.jsp?timestamp="+new Date().getTime();
        	 
    		if(user_num==""||user_num==null||user_pwd==""||user_pwd==null){			
    			alert("用户名或密码不能为空!");
    			return false;
    		}else if(checkNumber==""||checkNumber==null){
    			alert("验证码不能为空!");
    			return false;
    		}else{
    			this.LoginForm.action="LoginAction_login.action"; //设置处理程序
			    this.LoginForm.submit(); //提交表单			      
			   
    		} 
             }
             
             function checkNumberImage(){
            	 var imageNumber = document.getElementById("imageNumber");
     			imageNumber.src = "${pageContext.request.contextPath}/image.jsp?timestamp="+new Date().getTime();
             }
    	
             function checkFunction(){
            		return check();
            	}
              /**
               * 重置登录信息
               * @author 叶城廷
               */
              function radioSelect(){
            	  document.getElementById("user_num").value=document.getElementById("resetUser").value;
             	   var select=document.getElementsByName("userclass");
                  var selectButton=document.getElementById("selectButton").value;
                 //判断Action反馈重置按钮信息
                 if(selectButton=="管理员"){
                select[0].checked =false;   
                select[1].checked =true;   
               }else{}
                 }    
                 